 For the third time in a week Bemidji Firefighters responded to a report of a house fire. Shortly after nine Sunday morning firefighters responded to a fire on Countryview Drive in Grand Valley Township. Upon arriving the single family home was fully engulfed in flames with a number of other buildings in danger. It took over two hours and six fire trucks to extinguish the flames. The cause of the fire still remains under investigation. We don't know for sure yet. We're still wrapping up our investigation. It's appearing to be accidental in nature. The primary heat source was wood in the home. It seems like that may be the possible cause. While having three structure fires within the same week is not uncommon the fire department wants to remind everyone to have their heating systems inspected before we get further into the cold winter season. If you've enjoyed this segment of Lakeland News please consider making a tax deductible contribution to Lakeland Public Television.